Do avian blood parasites influence hypoxia physiology in a high elevation environment?

BMC Ecology
Farah Ishtiaq, S Barve

Abstract

Montane birds which engage in elevational movements have evolved to cope with fluctuations in environmental hypoxia, through changes in physiological parameters associated with blood oxygen-carrying capacity such as haemoglobin concentration (Hb) and haematocrit (Hct). In particular, elevational migrants which winter at low elevations, encounter varying intensities of avian haemosporidian parasites as they traverse heterogeneous environments. Whilst high intensity parasite infections lead to anaemia, one can expect that the ability to cope with haemosporidian infections should be a key trait for elevational migrants that must be balanced against reducing the oxygen-carrying capacity of blood in response to high elevation. In this study, we explored the links between environmental hypoxia, migration, and disease ecology by examining natural variation in infections status and intensity of avian haemoporidians across a suite of Himalayan birds with different migratory strategies while controlling for host phylogeny. We found predictably large variation in haemoglobin levels across the elevational gradient and this pattern was strongly influenced by season and whether birds are elevational migrants. The overall malaria infection in...Continue Reading

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Citations

Jan 23, 2021·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Sara ShoplandMichelle Barrows
Jan 18, 2021·International Journal for Parasitology·Karla Rodríguez-HernándezDiego Santiago-Alarcon

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Methods Mentioned

BETA
PCR
PCRs
environmental stress

Software Mentioned

lme4
MuMIn
ape
SEQUENCHER
coxme

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